/Engine/Source/Runtime/WebBrowser/Public/IWebBrowserSingleton.h
Registers a custom scheme handler factory, for a given scheme and domain. The domain is ignored if the scheme is not a browser built in scheme and all requests will go through this factory.
bool RegisterSchemeHandlerFactory ( [FString](API\Runtime\Core\Containers\FString) Scheme, [FString](API\Runtime\Core\Containers\FString) Domain, [IWebBrowserSchemeHandlerFactory](API\Runtime\WebBrowser\IWebBrowserSchemeHandlerFactory) * WebBrowserSchemeHandlerFactory )